/*电子时钟总体样式设置*/
#clock {
    width: 800px;
    font-size: 80px;
    font-weight: bold;
    color: red;
    text-align: center;
    margin: 20px;
}
/*时分秒数字区域的样式设置*/
.box1 {
    margin-right: 10px;
    width: 100px;
    height: 100px;
    line-height: 100px;
    float: left;
    border: gray 1px solid;
}
/*冒号区域的样式设置*/
.box2 {
    width: 30px;
    float: left;
    margin-right: 10px;
}